Study Of Low Temperature Plasma Technology For Glass-ionomer Cement Surface Modification

This paper studied surface modification of glass powder in Glass-ionomer Cement(GIC)by means of dielectric barrier discharges(DBD), etch of plasma make coarse degree of glasspowder increase, decrease the Ca2+consistence of surface and improve the hydrophilicproperty functional groups (Si-OH) obviously, ameliorate hydrophilic property of glasspowder, improve the mechanical intensity of GIC.Surface topography、surface hydroxy group content、improvement of hydrophilic propertyon surface of glass powder pretreatead and treatead by plasma were characterized by SEM,XPS, Contact angle analysis. Surface structure of GIC were characterized by FT-IR.Theresults show that plasma causes surface topography and character of glass powder changed.Hydrophilic property improvement is due to surface roughness and introduction of hydroxygroup. The improvement of hydrophilic proerty is benifit to the reaction of glass powder andpoly-acrylate.The reason of the setting time of GIC is extended because Ca2+concentration ofglass powder surface decline,improve the mechanical intensity of GIC.Study the effect ofsurface character of glass powder and the mechanical intensity and solidify time of GIC bythe treatment conditions(voltage, frequency, gas discharge gap distance and time) of DBD.Analysis influence factor, optimize the treatment conditions of DBD.The results show that the surface modification of glass powder in GIC can be worked byDBD and improve the mechanical intensity of GIC.